The Devil Stone by Caro Ramsay

“In the small Highland village of Cronchie, a wealthy family are found brutally murdered in a satanic ritual and their heirloom, ‘the devil stone’, is the only thing stolen. The key suspects are known satanists – case closed? But when the investigating officer disappears after leaving the crime scene, DCI Christine Caplan is pulled in to investigate from Glasgow in a case that could restore her reputation. Caplan knows she is being punished for a minor misdemeanour when she is seconded to the Highlands, but ever the professional, she’s confident she can quickly solve the murders, and return home to her fractious family. But experience soon tells her that this is no open and shut case. She suspects the murder scene was staged, and with the heir to the family estate missing, there is something more at play than a mythical devil stone. As she closes in on the truth, it is suddenly her life, not her reputation that is danger! Will Caplan’s first Highland murder case be her last?”–